Free enthalpy
(called Gibbs function and denoted G )
State function of the enthalpy H of a system, defined by equation
G = H - T S
where S is the entropy of the system and T is the temperature on the Kelvin scale.
Free enthalpy
of a reaction
The variation of free enthalpy of a system due to a chemical reaction.
It is measured by the difference between the free enthalpy of the products of the reaction and the free enthalpy of the reagents necessary to their production.